Spring

Spring Boot

1. How would you configure a Spring Boot application to connect to multiple databases? Describe the steps and considerations.
2. Explain how you would set up a Spring Boot application to handle high availability and load balancing.
3. Describe how you would implement a custom health check in a Spring Boot application and why it might be necessary.
4. How do you handle application configuration for different environments (development, testing, production) in Spring Boot?
5. What are the best practices for managing application properties and secrets in a Spring Boot application?
6. Explain how you would use Spring Boot’s Actuator to monitor application metrics and perform diagnostics.
7. How do you handle logging in a Spring Boot application, and how would you configure different log levels for various environments?
8. Describe how you would implement internationalization (i18n) in a Spring Boot application.

Spring Security

1. How would you secure a REST API in a Spring Boot application using Spring Security? Describe the steps for both authentication and authorization.
2. Explain how to configure OAuth2 authentication and authorization for a Spring Boot application.
3. Describe a scenario where you would use Spring Security’s method-level security annotations and how you would implement them.
4. How would you handle user role management and permissions in a Spring Boot application using Spring Security?
5. Explain how you would implement single sign-on (SSO) in a Spring Boot application.
6. What are some common vulnerabilities in web applications, and how does Spring Security help mitigate them?
7. How would you handle security for a microservices architecture with Spring Boot and Spring Security?
8. Describe how to use Spring Security to protect a web application from common attacks such as CSRF and XSS.

Spring Transaction Management

1. Describe a scenario where you would use the REQUIRES_NEW propagation type in a Spring Boot application.
2. How do you handle transactions in a Spring Boot application that needs to interact with multiple data sources?
3. Explain how you would implement and configure transaction management in a Spring Boot application that uses a combination of JPA and JDBC.
4. How would you handle transaction management in a Spring Boot application that involves a distributed transaction across microservices?
5. Describe how to use @Transactional to ensure data consistency in a Spring Boot application with complex business logic.
6. How would you test transaction management in a Spring Boot application to ensure proper rollback and commit behavior?
7. What strategies would you use to optimize transaction performance in a Spring Boot application?
8. How does Spring Boot handle transaction management in a batch processing scenario?

Spring Data JPA

1. How would you handle a situation where a Spring Data JPA repository method needs to perform complex queries that are not supported by the JPA query methods?
2. Describe how you would implement pagination and sorting in a Spring Boot application using Spring Data JPA.
3. How do you handle optimistic locking and pessimistic locking in a Spring Data JPA application?
4. Explain how you would use custom repository implementations in Spring Data JPA to extend functionality beyond the standard repository methods.
5. Describe a scenario where you would use the @Query annotation with native SQL queries in a Spring Data JPA repository.
6. How would you manage entity relationships (e.g., one-to-many, many-to-many) in Spring Data JPA? Provide an example of how to configure these relationships.
7. What are some best practices for handling large data sets and performance tuning in Spring Data JPA applications?
8. How would you configure a Spring Data JPA repository to support multi-tenancy in a Spring Boot application?